Complexes of substituted benzothiazoles. 1. Cobalt(II), copper(II), and zinc(II) complexes of 2,2′-<i>o</i>-phenylenebisbenzothiazole; a potential N or S donor ligand

Abstract

A series of cobalt(II), copper(II), and zinc(II) complexes of the title ligand are reported. 1:1 complexes of cobalt and zinc, M(OBT)X 2 (M = Co, Zn; X = Cl, Br, I, NCS), have four-coordinate pseudo-tetrahedral stereochemistries while for copper (X = Cl, Br), distorted square geometries are suggested. Six-coordinate 1:1 derivatives are also obtained for cobalt and copper, M(OBT)(NO 3 ) 2 (M = Co, Cu), while the 1:2 derivative Cu(OBT) 2 (ClO 4 ) 2 -2H 2 O may be square planar. OBT appears to coordinate as an N 2 donor in all cases. Preliminary X-ray data confirm a distorted square CuN 2 Cl 2 structure for the copper chloride complex. Hydrogen bonded chloroform solvate molecules appear to be present in three cobalt complexes (X = Cl, Br, NCS).